Greely High School is a public high school for grades 9 to 12 located in Cumberland, Maine, United States.

It also has a professional teaching staff of 64 and 50% of the teachers have advanced degrees.

Greely High School is a part of Maine School Administrative District 51, which serves the towns of Cumberland and North Yarmouth.

Renovated and added onto over the years, the building originally opened in 1868.

Another addition completed in 2018 added a new auditorium to the school.